diff --git a/algorithms/_base.py b/algorithms/_base.py
index 767087b..e8639fe 100644
--- a/algorithms/_base.py
+++ b/algorithms/_base.py
@@ -209,7 +209,7 @@ if __name__ == '__main__':
                                     allow_square_movement=True,
                                     allow_no_op=False)
     env = SimpleFactory(dirt_properties=dirt_props, movement_properties=move_props, n_agents=N_AGENTS, pomdp_radius=2,  max_steps=400, omit_agent_slice_in_obs=False)
-    env = DummyVecEnv([lambda: env])
+    # env = DummyVecEnv([lambda: env])
     print(env)
     from stable_baselines3.dqn import DQN
 
diff --git a/environments/factory/base_factory.py b/environments/factory/base_factory.py
index c10ea68..09968a4 100644
--- a/environments/factory/base_factory.py
+++ b/environments/factory/base_factory.py
@@ -210,12 +210,13 @@ class BaseFactory(gym.Env):
 
         # Step the door close intervall
         agents_pos = [agent.pos for agent in self._agent_states]
-        for door_i, door in enumerate(self._door_states):
-            if door.is_open and door.time_to_close and door.pos not in agents_pos:
-                door.time_to_close -= 1
-            elif door.is_open and not door.time_to_close and door.pos not in agents_pos:
-                door.use()
-                self._state[self._state_slices.by_name(h.DOORS)] = 1 if door.is_closed else -1
+        if self.has_doors:
+            for door_i, door in enumerate(self._door_states):
+                if door.is_open and door.time_to_close and door.pos not in agents_pos:
+                    door.time_to_close -= 1
+                elif door.is_open and not door.time_to_close and door.pos not in agents_pos:
+                    door.use()
+                    self._state[self._state_slices.by_name(h.DOORS)] = 1 if door.is_closed else -1
 
         reward, info = self.calculate_reward(self._agent_states)